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ELECTRONICS UPDATE Texas Instruments Offers New GPS Software —Literature Available A new relative-positioning soft- ware package, called Geomark, de- signed to process data collected by TI-4100 Global Positioning System (GPS) Navigators was recently in- troduced by Texas Instruments. The Geomark software for GPS provides highly accurate postpro- cessing positioning information from data collected by two TI-4100 GPS Navigators simultaneously tracking the same four GPS satel- lites. The TI-4100 is a satellite-based navigation system that provides precise absolute positioning or rela- tive point-positioning surveys, in- cluding aerial surveys, offshore plat- form positioning, marine navigation and oceanographic and geophysical surveys. According to John Applegate, marketing manager, commercial GPS, the introduction of the Geo- mark software gives the TI-4100 user a totally self-contained, on-site collection and postprocessing sys- tem that can be used anywhere in the world. "The software provides compre- hensive, documented solutions to relative positioning problems that were previously cumbersome and expensive," he said. "Additionally, Geomark provides these solutions with much greater accuracy, speed, flexibility, ease and economy." Accuracies are obtained using the broadcast ephemeris data recorded by the TI-4100 and do not require the use of precise ephemeris that some GPS systems must obtain from other sources, he added. The Geomark software provides typical solutions in less than one hour of off-line processing using as little as 30 minutes of collected data, including data cassette translation. Geomark offers totally automatic operation. Users may enter custom specifications by overriding the au- tomatic defaults. Users can also specify the reference location or derive the location using the TI- 4100. Geomark processes both Pre- cise Code (P-Code) or Coarse/Ac- quisition (C/A Code). The software uses broadcast empheris, but can also support post-mission precise ephemeris. Geomark records all necessary data on a one-page report that pro- vides the user with the monument- to-monument baseline vector. The system can provide the answer in standard latitude, longitude, alti- tude; state plane; UTM; or local datum. The complete TI-4100/Geomark package is available now and in- cludes Geomark and MS-DOS™ software. The package also includes the TI Portable Professional Corn- February 1, 1986 puter with 256K bytes RAM, a mul- tifunction board with an additional 256K RAM, a single floppy diskette drive, a 10-megabyte Winchester hard disk drive, an 8087 coproces- sor, three-plane graphics board, a built-in high-resolution 9-inch color monitor, two Memtec cassette read- ers, two RS-232 cables, and the TI 855 microprinter. 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